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"The launch of iOS 4 has received a mixed response from users. While a vast majority of iPhone users are really enjoying the new features and performance improvement in the latest iOS, some iPhone 3G users have reported that iOS 4 has slowed down their iPhone. If you have seen..."
<https://ijunkie.com/how-to-downgrade-iphone-3g-from-ios-4-to-iphone-os-3-1-3/>